I always wondered how she cleaned herself up. It would be a messy deed, carrying a 2 day old decomposing body. But, now, I think I understand.
Here's my new theory, with the new site/info in mind...
I believe there was a fight on the 15th, likely shortly after Cindy returned home from GG with Caylee. Casey left, in a fury, with Caylee. Tapes Caylee and throws her in the trunk, to keep her quiet. She texts Tony most of the night. Caylee dies.
She comes home on the 18th, borrows the shovel, bags and wraps Caylee ( Caylee was not in a bag till this point, hence the stain), uses the pool ladder to get over fence, by playhouse (cadaver dogs hit in the rear, and by the pool), and carrys Caylee into the wooded area, burys her or maybe threw her in the water, animals, hurricane, water, brings her closer to the road, on the Suburban side...Caseys able to wash up in the pool (decomp)...returned the shovel. She had approx. 1 hour with the shovel, I think it's possible. A bonus? No one to see her going into the woods.
link to map showing A home and site proximity...
http://marinadedave.files.wordpress.com/2008/12/aerial-body-map.jpg
This may be the reason, as well, for the A's apparent change of heart. Maybe they found a piece of clothing Caylee was wearing on the 15th, in the video? Or maybe they found pj's? Maybe they know the A's lied about the 15th, 16th? Maybe that is the cause of the rumblings re obstruction? Depending what time Cindy returned home, and Casey was there, I think the fight started quickly, Caylee MIGHT have not had a chance to get pj's on. Her usual bedtime was 8-10 per Cindys interviews.
A few thoughts...